Glory Enough for All

OCLC says this story of the discovery of the cause and treatment for diabetes
was produced by Gemstone and Primedia in Toronto. It is on the WGBH web site
as a Masterpiece Theatre series in 1989-90. They gave me a Toronto phone
number for Gemstone/Primedia that doesn't work (416-361-0306). I've searched
Internet Yellow Page and Business directories and everything else I can think
of to no avail.